1

thread standard +normal diameter+pitch+class

thread size of workpiece.

2

thread quality control

how to ask the precision of thread wheels

3

thread length of workpiece

seclect the thickness of thread wheels

4

material of workpiece

select tool marks of thread wheels 

5

PT & NPT taper thread of workpiece 

slelct how to adjust the turning direction of thread wheel

6

thread wheel specifications =outer diameter*thickness*thread standard+Pitch